Ice-cream Posted June 9, 2005 Share Posted June 9, 2005 hey guys, ive got this question which i know it should be pretty straight forward but for some reason, i cant get the answer: Calculate the ionisation energy in kJ for a mole of hydrogen atomst that are in the n=2 energy level. I think i just use E = -2.18e-18 Ze2 (1/nfinal - 1/ninitial) what i did was substitute 1 for Z, infiinity for n final, so that becomes zero, then n = 2 into n initial. my answer ended up being 5.45e-19J, which is way too small for the answer...the answer provided was 328kJ. can any1 point out what im doing wrong? thanx Link to comment Share on other sites More sharing options...
swansont Posted June 9, 2005 Share Posted June 9, 2005 hey guys' date=' ive got this question which i know it should be pretty straight forward but for some reason, i cant get the answer: Calculate the ionisation energy in kJ for [b']a mole[/b] of hydrogen atomst that are in the n=2 energy level. I think i just use E = -2.18e-18 Ze2 (1/nfinal - 1/ninitial) what i did was substitute 1 for Z, infiinity for n final, so that becomes zero, then n = 2 into n initial. my answer ended up being 5.45e-19J, which is way too small for the answer...the answer provided was 328kJ. can any1 point out what im doing wrong? thanx You solved for one atom. Is that what the question was asking for? (Emphasis added, hint, hint) Link to comment Share on other sites More sharing options...
Ice-cream Posted June 10, 2005 Author Share Posted June 10, 2005 wow! thanks heaps! i can't believe i didn't see that, no wonder i was getting all these similar Q wrong! Link to comment Share on other sites More sharing options...
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